Shock-absorbing base for jar-molding machines



April 21, 1931. CAMERQTA 1,802,107

SHOCK ABSORBING BASE FDR JAR MOLDING MACHINES Filed June 6. 1928 3 I :M 16 w H 4., W R V H 2- WIITNEZES B Lauzls'r iife z r afa,

BY $2M w A 12 jg; ATTO Patented Apr. 21, 1931 UNITED STATES 1,soz,1 07

PATENT orl-lcs LOUIS A. CAMEBOTA, OEBUBLINGTON, NEW JERSEY, ASSIGN'ORTO WALTER WOOD, OF

PHI ADELPHIA,

PENNSYLVANIA snocx-ansoannve BASE non JAauoLnme nracnmns Application filed June 6,

My inventionrelates to a shock absorbing base for whatis termed in foundry ractice a jar-molding machine, a vibratmg or jolting device commonly used in foundries for molding sand in a flask preparatory to making a casting.

The objects of -my invention are to provide a base for a. machine of this character which will withstand the severe jolting ac- 1 companying the operation of the machine, to increase the efficiency of the machine, and to reduce to a minimum the wear and tear on the foundation.

While I am fully aware that machine foundations have been made in which resilient materials'of various descriptionhave been employed to absorb vibrations, my invention is novel in that it satisfies the unusual requirements which are characteristic of jar-molding machines, in which the foundation is subject to very severe shock at periodic intervals and in which the character of the base has a pronounced effect on the efiiciency of the machine as measured by the time or the number of vibrations required to form the mold.

The special means which. I employ, combined with the other instrumentalities of this invention and for the purpose as before 39 premised, ma be understood by reference to the embodiment of the invention shown in the accompan g drawings in which Fig. I shows a ront elevation, partly in section, of a jar-molding machine and its foundation; and,

Fi II shows an alternate form of shock absor ing base.

The drawings show in Fig. I a jar-molding machine, comprehensively designated by the numeral 1, and being used in this instance for making a sand mold for centrifugally cast pipe. Upon the jar-molding machlne 1, there is shown a closed cylindrical flask 2, a pattern 3 concentric with the flask, and the sand lining 4, which is in the process of being formed into a mold.

The jar-molding machine 1 illustrated in the drawings is of the pneumatic type and includes a table plate 5 having integral therewith a piston 6 movable in the cylinder 1928. Serial 110. 283,214.

' 9. A control valve 8 regulates the admission of air to the chamber beneath the piston 6, to cause its intermittent operation, a hunter pin 7 being utilized to cut off the air as the piston 6 reaches the top of its stroke. Mounted circumferentially of the cylinder 9 are a series of jarring discs 14 which receive the shock accompanying the drop of the table plate 5 and transmit it to the base 10 of the machine.

The base 10 of the jar-molding machine 1 rests upon a. housing 11 which is shown as a separate member from the base plate 12, the latter bein machined to fit within the housing 11. ompletely confined within and filling the enclosure bounded by the base plate 12 and the housing 11 is a layer or layers of slabs of compressed granulated cork A which I preferably employ as the shock absorbing medium for reasons hereinafter set forth. The entire apparatus is shown supported on a concrete foundation 13. To retain the base 10 of the machine 1 in level position, I employ a number of rods 15, preferably situated at the four corners of the base 10, which penetrate the cork A and its housing 11 and which are secured at their lower ends in theofoundation 13. At the headof each rod 15 there is an adjustin nut 16 and spring 17.

In ig. II the shock absorbing medium for the housing 11 is shown as a laminated pad with layers of compressed granulated cork A separated by a metal plate B.

While the jar-molding machine illustrated in the drawings is of a particular type, the supporting base is readily adaptable for use in connection with other ty es of jolting or jarring machines used or forming a mold. The base is also suitable for ar-molding where the flask is permitted to drop successively by gravity and for jarring machines when used for shaking out sand molds.

The operation of the machine isas follows: The air is turned on and the table plate 5 is caused to vibrate violently, the valve 8 controlling its motion. In the customary use of the machine the molding sand is poured from above into the annular space between the pattern 3 and the flask 2. As

. the flask 2 is rapidly raised and lowered,

the lowering movement 18 accompanied by considerable shock which serves to pack the sand to form the mold 4 in the flask 2. It is most important with machines of this character that the pattern 3 be kept in vertical alignment at all times, and accordingly the adjusting nuts 16 can be periodica ly turned to level the housing 11. While, due to the intense shock and heavy weight actin upon the housing 11, it becomes occasiona ly necessary to readjust the housin 11, the granulated cork A being substantially incompressible, there is no appreciable settling of the base 10 over a long period of time.

With reference to the kind of shock absorbing medium employed in the housing 11, I have found that compressed granulated cork has peculiar qualities of elasticity and resiliency which cause it to effectively dead: on severe shock, and that while ordinary cork and other similar materials will disintegrate or become permanently distorted under excessive shock, compressed granulated cork, when substantially confined, will not deteriorate. The shock-absorbing pad, while essentially including a layer of compressed cork, or material having substantially the same compactness and resiliency, may, of course, include other materials such as metal plates, provided that the composite pad is wholly confined within and 11s the surrounding housing. In jarring machines of the character illustrated, when large wooden planks are used for the base of the machine they break up in a short time, and with their use it is impossible to stand near the machine, whereas with the use of my foundation one can work with comfort in the near vicinity of the machine. Furthermore, supplementing the advantages already described, with the use of the shock absorbing medium mentioned, not only is the impact arrested to such an extent that the foundationjs capable of withstanding the shock, but the nature of the recoiling action of the base is such that the efiiciency of the machine is materially increased, there bein a reduction in the number of (jolts required either when forming the mol in the flask or when shaking it out by the jarring process.

While I have described my invention with some particularity, it will be apparent to those skilled in the art that changes may be madein the form of the apparatus disclosed without departing from the spirit of my invention, as set forth in the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is

1. The combinationof a jar-molding macompressed cork.

chine and a shock-absorbin base, said base comprising a housing, and material completely confined within and filling said housmg; said material including a layer of 7 2. The combination of a j ar-molding machine and a shock-absorbing base, said base comprising a housing includin relatively movable upper and lower mem ers, and a shock-absorbing pad completely confined within and filling said housin said pad including a layer of compresse cork.

3. The combination of a jar-moldin machine and a shock-absorbing base, sai; base comprising a substantially box-shaped housing, including relatively movable upper and lower members, and shock-absorbin material completely confined within anc? filling said housing, said material including a layer of compressed cork.

4. The combination of a jar-moldin machine and a shock-absorbing base, sai base including two relatively movable members, the one a part of the foundation and the other a part of the jar-molding machine, said members forming an enclosure, and a shock-absorbing pad completely confined within and filling said enclosure, said pad including a layer of compressed cork.

5. The combination of a jar-molding machine and a shock-absorbing base, said base including two relatively movable members, the one a part of the foundation and the other a part of the jar-molding machine, said members forming an enclosure, mate- 1 rial com letely confined within and filling said enc osure, said material including a layer of compressed cork, and adjusting means for regulating the normal relative position of said relatively movable members. 105

In testimony whereof, I have hereunto signed my name at Florence, New Jersey,

this 31st day of Ma 1928.

LOUlS A. CAMEROTA. 

